IICI dead power supply

[OTAlucard]

i have a apple IICI with a dead Power Supply and i was going to buy another one but they are 60 - 80 $ on ebay SO

i was thinking about just modding a newer powersupply to fit into the old case and solder the wires together and make sure it turns on allright etc Will this work OR will there be a better way to fix it ?

if not i need to know the voltages on the wires please

 

[Unknown_K]

Join the google group LEMswap and post a WTB (wanted to buy) IIci power supply (I think the IIcx and maybe another machine used the same supply). Ebay is great for some things but for mac parts LEMswap is cheaper.

If you still need the wiring I think that is inside one of my mac hardware books and I can look it up.

 

[trag]

Join the google group LEMswap and post a WTB (wanted to buy) IIci power supply (I think the IIcx and maybe another machine used the same supply).

Compatible power supplies with IIci:

IIcx, IIci, IIvi, IIvx, Quadra 700, Centris 650, Quadra 650, Power Mac 7100.

Also, for on-the-bench testing you can use a IIsi power supply. The connectors and wiring are compatible although it obviously won't fit in the case.

 

[OTAlucard]

Sick OF people looking at my hands

 

[wthww]

It should be fine, just get a wiring diagram. Also, your fingers, I SEE THEM!

//Tyler

 

[equill]

i have a apple IICI with a dead Power Supply ...

'Dead' doesn't give us much room to advise you about an effective response. What kind of dead? Do you get nothing at all from a previously working IIci, or rapid clicking when you hold in the power key on the keyboard or the rear auto-reboot switch? Is the magic smoke gushing or trickling out? Did you do any work inside the case just before this happening? Is the ROM-select jumper in place at W1? If you are using one, is the video card securely seated in its NuBus slot, and does the external display work correctly with another Mac? Have you a DB-15/VGA adapter in the setup? Was the PSU properly bottomed in its socket, with the plastic tang on the pillar of the drive-shelves engaged?

If you were getting rapid clicking when you tried to boot, you may be one of the large club of users with TRKL problems. While Astec PSUs more so, and Delta alternatives to some extent, do fail in predictable ways, repair is possible if the cause is failed filter-capacitors, or more often, change in value of the biasing diode in the saw-tooth oscillator, with age. There is already a how-to to replace, or augment, the latter. Since you have the PSU open, it will be less of a fag to explore that biasing diode while you are there, but beware the filter capacitors. They bite, and the biting-power lasts a long time unless they are discharged. You could usefully trawl these forums using 'Astec' and 'IIci' as your search terms.

de

 

[OTAlucard]

i have a apple IICI with a dead Power Supply ...

'Dead' doesn't give us much room to advise you about an effective response. What kind of dead? Do you get nothing at all from a previously working IIci, or rapid clicking when you hold in the power key on the keyboard or the rear auto-reboot switch? Is the magic smoke gushing or trickling out? Did you do any work inside the case just before this happening? Is the ROM-select jumper in place at W1? If you are using one, is the video card securely seated in its NuBus slot, and does the external display work correctly with another Mac? Have you a DB-15/VGA adapter in the setup? Was the PSU properly bottomed in its socket, with the plastic tang on the pillar of the drive-shelves engaged?

If you were getting rapid clicking when you tried to boot, you may be one of the large club of users with TRKL problems. While Astec PSUs more so, and Delta alternatives to some extent, do fail in predictable ways, repair is possible if the cause is failed filter-capacitors, or more often, change in value of the biasing diode in the saw-tooth oscillator, with age. There is already a how-to to replace, or augment, the latter. Since you have the PSU open, it will be less of a fag to explore that biasing diode while you are there, but beware the filter capacitors. They bite, and the biting-power lasts a long time unless they are discharged. You could usefully trawl these forums using 'Astec' and 'IIci' as your search terms.

de

first the fan quit working the fan was fine it just stoped geting power

then the fuse blew

then i replaced the fuse with the 3.15 amp fuse that it came with in 1989 thank god the store had one

then that little thing blew that is in the second picture up from the last in the above post

insted of haveing more trouble with the same power supply i was just going to replace it with a newer one and jerry rig a switch on the side

 

[equill]

Only you can decide how you will proceed, but I suggest that you factor in your time and learning curve as well as price and convenience when you think about a non-Apple PSU as replacement. Mods and hacks take time, as well as knowledge. The TRKL supply in active power-control Macs is implicated not only in startup but also in (software-controlled) shutdown. If the TRKL is your present bugbear, a fix will be quicker than replacement. If the blown fuse indicates capacitor failure (shorting), that also is more quickly fixed than a hack is arranged. A 'switch on the side' is an inadequate substitute for the designed startup procedure of a IIci. On your side is that the IIci was one of Apple's most successful models, and there must be many of them in cupboards and closets awaiting a new life, even if that is only through transplant of their vital organs. Good luck.

de

 

[OTAlucard]

its all done thanks for all your help i wasnt realy sure if it would work or not so i wanted to make sure i just went on faith

and thanks for unknown_k for sending me the pinouts for the wires

thank you for putting up with me

 

[Unknown_K]

Glad to help. Reference books are nice to have and come in usefull for this kind of thing.

I would have probably just found an original replacement PS (usually not worth fixing because of how cheap they are to replace). Lately I have been recapping a bunch of old Mac motherboards (they needed it), and will recap one of my IIcx's soon (getting more 47uf capacitors since I ran out) so I can run a Daystar 040/33 with the Daystar IIcx adapter mounted on my only socketed CPU IIcx motherboard (which needs recapped, its cranky).

 

[Moofo]

I have one PS I can sell you cheap. Message me !